(2) (z) Just to make sure as a preliminary question... if the base quantity is XB and the actual value of the quantity is X, write down the fundamental definition of Xpu- In a 3 phase balanced AC system, suppose that we have already chosen the 3 phase power base S and the line to line voltage base V. Now we choose the rest of the bases in a coordinated way. (a) What is the single phase power base SB that makes the 3 phase power and the single phase power numerically equal in per unit? (b) What is the line to neutral voltage base VB that makes the line to line voltage and the line to neutral voltage numerically equal in per unit? Show that it works. (c) What is the line current base IB that makes S = VI* work out in per unit? First give the answer expressing Ig in terms of SB and VB. Then express IB in terms of S and V. (d) What is the impedance base ZB that makes the V = ZI work out in per unit? First give the answer expressing ZB in terms of VB_and IB. Then express ZB in terms of VB and SB. Then express ZB in terms of S and V. (e) Now suppose that the per unit system above is relabeled as Sold, Vilold etc and that we also choose a new per unit system based on Sonew¸ vllnew Derive °B (B B B from first principles the formula expressing Znew in terms of Zold Soold, vlold B pu , PB s3ønew vllnew B (B

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Single Phase Transformer

A single-phase transformer is a type of power transformer. It is an electrical device that accepts converts the single phase alternating power into single phase alternating power. In this power conversion the voltage is stepped up or down. If the voltage is stepped up, the current will be stepped down and if the voltage is stepped down, the current will be stepped up.